Van Jones, former Obama adviser, takes no prisoners in new anti-Keystone XL video

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3. Not really known yet what dilbit does to pipes.

The National Academy of Sciences is looking at that right now:

The committee will analyze whether transportation of diluted bitumen (dilbit) by transmission pipeline has an increased likelihood of release compared with pipeline transportation of other crude oils. Should the committee conclude that an increased likelihood of release exists, it will review the federal hazardous liquid pipeline facility regulations to determine whether they are sufficient to mitigate the increased likelihood of release.

In the first phase of the project, the committee will examine whether dilbit can affect transmission pipelines and their operations so as to create an increased likelihood of release when compared with other crude oils transported through pipelines. Should the committee conclude there is no increased likelihood of release or find there is insufficient information to reach such a conclusion, a second phase of the project will not be required and the committee will prepare a final report to the Office of Pipeline Safety (OPS) of the Pipeline and Hazardous Materials Safety Administration (PHMSA). This report may include recommendations for improving information to assess the likelihood of failure.

http://www8.nationalacademies.org/cp/projectview.aspx?key=49461

Dilbit requires higher pressure than heavy crude, so there will be a higher possibility of ruptures regardless of the content.